Clojure 的映射:键和值的顺序是否相同? [英] Clojure's maps: are keys and vals in same order?

问题描述

可以依靠吗(= m (zipmap (keys m) (vals m)))在 Clojure 1.3+ 中?

Is it ok to rely on (= m (zipmap (keys m) (vals m))) in Clojure 1.3+?

在某些情况下，这种行为会使代码更具可读性，例如

Having this behavior makes for slightly more readable code in some situations, eg

(defn replace-keys [smap m]
  (zipmap (replace smap (keys m)) (vals m)))

对比

(defn replace-keys [smap m]
  (into {} (for [[k v] m] [(smap k k) v]))

推荐答案

我可以(正式地)确认这个问题的答案是肯定的.keys 和 vals 的文档字符串在 Clojure 1.6 中更新以提及这一点(参见 http://dev.clojure.org/jira/browse/CLJ-1302).

I can confirm (officially) that the answer to this is yes. The docstrings for keys and vals were updated in Clojure 1.6 to mention this (see http://dev.clojure.org/jira/browse/CLJ-1302).

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